Electrochemical sensor based on MWCNTs/Co3O4/SPGE for simultaneous detection of Sudan I and Bisphenol A

Abstract

This paper presents a sensitive simultaneous detection procedure for Sudan I and bisphenol A based on the multiwalled carbon nanotubes (MWCNTs)/Co3O4 nanocomposite modified screen-printed graphite electrode (SPGE). This MWCNTs/Co3O4 nanocomposite was prepared by the hydrothermal technique, and characterized by Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). The electrochemical properties of MWCNTs/Co3O4 nanocomposite modified SPGE were analyzed by cyclic voltammetry (CV), differential pulse voltammetry (DPV), chronoamperometry (CHA), as well as linear sweep voltammetry (LSV). From the electrochemical results, a synergy between MWCNTs and Co3O4 nanoparticles (NPs) was detected as improved interfacial electron transfer, which was accompanied by a greater catalytic function for electrochemical oxidation of Sudan I. Based on the optimized condition, MWCNTs/Co3O4/SPGE exhibited the linear dynamic ranging between 0.05 and 600.0 μM detection of Sudan I with a limit of detection (LOD) 0.02 μM. Also, the as-prepared electrode was assessed for simultaneous detection of Sudan I and Bisphenol A. In the course of electrooxidation processes of these analytes, two complete peaks at 380 and 520 mV were observed on the modified electrode. At the end, utility of this new electrochemical sensor was performed to determine Sudan I and Bisphenol A in some real samples with good accuracy and precision.

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“…Thus, the development of a sensitive and selective method for the detection of bisphenol A is very important for both human health and environmental protection. Methods that have been used to monitor these analytes include electrochemical sensors, mass spectrometry (GC/MS) and high-performance liquid chromatography (HPLC) with detection by fluorescence or spectrophotometry (UV), or mass spectrometry (LC/MS or LC/MS/MS) [9][10][11][12][13][14].…”

Synthesis of vanadium oxide nanoplate for electrochemical detection of amaranth in food samples

“…There have been numerous investigations to achieve techniques for effective and green detection of azo dyes [7][8][9]. The electrochemical methods are showing great attention in studying analytes redox behaviour, and a high interest in electrochemical methods giving a fast response, low cost, high sensitivity, and selectivity exists [10][11][12][13][14][15]. Voltammetry is a technique utilized for the analysis of compounds that undergo oxidation or reduction.…”